MCQ
Among the followings which will readily undergo ${{S}_{{{N}^{2}}}}$ reaction ?
- A$4-$ Chlorobut $-1-$ ene
- B$1-$ Chlorobut $ -1-$ ene
- ✓$1-$ Chlorobut $-2-$ ene
- D$2-$ Chlorobut $- 1-$ ene
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